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#373 move multiple getOrientation() methods to super class/interf

There are 7 getOrientation() methods in CategoryPlot, FastScatterPlot, Pannable, PolarPlot, ThermometerPlot, XYPlot, Zoomable. All classes are PLots. I have to cast my instance to one of these classes to finally get the orientation (for generic value label setting) - better would be just 1 getOrientation() method in Plot class .